If $abc=p$ and $A=\begin{bmatrix} a & b & c \ c & a & b \ b & c & a \end{bmatrix}$ such that $AA'+I,$ then $a,b,c$ are the roots of the equation
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If $abc=p$ and $A=\begin{bmatrix} a & b & c \ c & a & b \ b & c & a \end{bmatrix}$ such that $AA'+I,$ then $a,b,c$ are the roots of the equation